无线传感器网络中一种自适应的退避算法

802.15.4协议中CSMA/CA信道接入方式为了避免再次碰撞使用BEB退避算法,在重负载的情况下网络性能较差。提出一种自适应的退避算法,它用报文的冲突概率来预测节点附近信道的争用状况,在不同的网络状况下,竞争窗口的取值采用相应的退避策略,动态地控制节点的退避范围,以达到改善网络性能的目的。分析与仿真结果表明,新的算法与传统的退避算法BEB算法相比,在网络负载重的情况下,有效地降低了数据包的冲突概率,减少了时延,提高了网络的吞吐量,同时对信道的公平性也有所改善。

ADAPTIVE BACKOFF ALGORITHM FOR WIRELESS SENSOR NETWORKS

CSMA/CA channel access method in 802.15.4 protocol adopts BEB backoff algorithm for avoiding late collision,but in heavy load situation the performance of the network is poor.An adaptive backoff algorithm was presented in the article,it predicted the channel collision status nearby the nodes by using conflicting probability of data packets,the value of competition window adopted the corresponding backoff strategy in different network condition,thus controlled dynamically the range of backoff nodes so as to ...